pregnant or just sick

Rhina
My gf is late on her period for about 5 days now. We tested twice and both came back negative. She gets mild cramping for abour 1 min and disappears straight after but no blood comes out and she started getting whit discharge often. Here period normally comes on the 25-27 of every month. Im worried sick for her as we both cant afford to have a baby. 
Posted: tuesday 6 of march 2017. Australia